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Posted to issues@systemml.apache.org by "Matthias Boehm (JIRA)" <ji...@apache.org> on 2016/09/10 23:02:21 UTC

[jira] [Updated] (SYSTEMML-905) Incorrect compressed unary aggregate w/ existing uc group

     [ https://issues.apache.org/jira/browse/SYSTEMML-905?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matthias Boehm updated SYSTEMML-905:
------------------------------------
    Description: 
There is potential for incorrect unary aggregates over compressed matrices in the presence of a mix of OLE/RLE groups with existing UC group. Since we directly invoke uncompressed operations, the UC group computation resets the partial aggregates computed over predecessor groups. 

The fix should invoke uncompressed operations first before processing OLE and RLE groups.

> Incorrect compressed unary aggregate w/ existing uc group
> ---------------------------------------------------------
>
>                 Key: SYSTEMML-905
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-905
>             Project: SystemML
>          Issue Type: Bug
>          Components: Runtime
>            Reporter: Matthias Boehm
>
> There is potential for incorrect unary aggregates over compressed matrices in the presence of a mix of OLE/RLE groups with existing UC group. Since we directly invoke uncompressed operations, the UC group computation resets the partial aggregates computed over predecessor groups. 
> The fix should invoke uncompressed operations first before processing OLE and RLE groups.



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